Four Elements Trainer is a massive undertaking set in the universes of Avatar: The Last Airbender and The Legend of Korra, and will be four complete games all united into one. Along the way, you'll find plenty of (fuckable!) characters, quests, stories, fights, and mysteries to unlock.
Everything you see in the game is able to be completed -- content that hasn't been finished isn't included. There's no tease! It's all content!